Morning
My only concern is,will your phone work on the network here? Check it with your local shop where you have bought it and ask them if it works in Europe and is the phone sim free..saves you buying a new one here.
You will have roaming charges..anyone going on holidays and taking their phone with them know they can be massive so wouldn't recommend that.
Here are some examples..
international data roaming bill of 4,000 CHF and
Dont use your Sunrise SIM for data in the UK!
However there is the option of checking if your phone will work here and just getting a pre paid card to get you started.
Once the permit is sorted you can check out the data offers for Blackberry with
Sunrise,
Swisscom,
Orange etc..
Here is a thread that goes into a bit more details of using foreign mobile phones in Switzerland.
Using foreign mobile phone in Switzerland?
Hope it helps..
Joey
* note i am not affiliated with any mobile operator link above *